From the contest page:
This is an IOI style contest. This
means that the problems will be
partially graded. You will get score
for passing certain test data. The
details of the failed test cases will
also be visible on your solution page.
So the format of the solution page will be different from what we are used to so far. It would be great if there are a few practice problems to get used to the format of the solution page.
There is a new section for this: http://www.codechef.com/problems/school